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James Arnold Crowther
James Arnold Crowther (1883–1950) was a British physicist who worked on beta-decay, beta particle scattering with JJ Thomson in connection with the first tests of modern atomic physics (see plum pudding model) as well as X-ray scattering including practical applications in medical radiology. He authored numerous textbooks and was a founding Fellow of the Institute of Physics. Education and career Born in Sheffield, Yorkshire, England on Aug. 28, 1883, Crowther attended Cambridge University from 1903 to 1906.Whiddington, R"Prof. JA Crowther."Nature 165.4202 (1950): 750-751. In 1906, as the Hutchison Student of St. John's and Open Research Student of Emmanuel, he published "On the coefficient of absorption of the β rays from uranium" based on work he did under the direction of Thomson. In this work Crowther measured the intensity of radiation from uranium as it passed through various material like mica, cardboard, and especially a series of metal foils. He continued this work fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beta-decay
In nuclear physics, beta decay (β-decay) is a type of radioactive decay in which an atomic nucleus emits a beta particle (fast energetic electron or positron), transforming into an isobar of that nuclide. For example, beta decay of a neutron transforms it into a proton by the emission of an electron accompanied by an antineutrino; or, conversely a proton is converted into a neutron by the emission of a positron with a neutrino in what is called ''positron emission''. Neither the beta particle nor its associated (anti-)neutrino exist within the nucleus prior to beta decay, but are created in the decay process. By this process, unstable atoms obtain a more stable ratio of protons to neutrons. The probability of a nuclide decaying due to beta and other forms of decay is determined by its nuclear binding energy. The binding energies of all existing nuclides form what is called the nuclear band or valley of stability. For either electron or positron emission to be energetically po ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rutherford Scattering
The Rutherford scattering experiments were a landmark series of experiments by which scientists learned that every atom has a Atomic nucleus, nucleus where all of its positive charge and most of its mass is concentrated. They deduced this after measuring how an alpha particle beam is scattering, scattered when it strikes a thin Foil (metal), metal foil. The experiments were performed between 1906 and 1913 by Hans Geiger and Ernest Marsden under the direction of Ernest Rutherford at the Physical Laboratories of the University of Manchester. The physical phenomenon was explained by Rutherford in a classic 1911 paper that eventually led to the widespread use of scattering in particle physics to study subatomic matter. Rutherford scattering or Coulomb scattering is the elastic scattering of charged particles by the Coulomb interaction. The paper also initiated the development of the planetary Rutherford model of the atom and eventually the Bohr model. Rutherford scattering is now ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scientists From Sheffield
A scientist is a person who researches to advance knowledge in an area of the natural sciences. In classical antiquity, there was no real ancient analog of a modern scientist. Instead, philosophers engaged in the philosophical study of nature called natural philosophy, a precursor of natural science. Though Thales ( 624–545 BC) was arguably the first scientist for describing how cosmic events may be seen as natural, not necessarily caused by gods,Frank N. Magill''The Ancient World: Dictionary of World Biography'', Volume 1 Routledge, 2003 it was not until the 19th century that the term ''scientist'' came into regular use after it was coined by the theologian, philosopher, and historian of science William Whewell in 1833. History The roles of "scientists", and their predecessors before the emergence of modern scientific disciplines, have evolved considerably over time. Scientists of different eras (and before them, natural philosophers, mathematicians, natur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1950 Deaths
Events January * January 1 – The International Police Association (IPA) – the largest police organization in the world – is formed. * January 5 – 1950 Sverdlovsk plane crash, Sverdlovsk plane crash: ''Aeroflot'' Lisunov Li-2 crashes in a snowstorm. All 19 aboard are killed, including almost the entire national ice hockey team (VVS Moscow) of the Soviet Air Force – 11 players, as well as a team doctor and a masseur. * January 6 – The UK recognizes the People's Republic of China; the Republic of China severs diplomatic relations with Britain in response. * January 7 – A fire in the St Elizabeth's Ward of Mercy Hospital in Davenport, Iowa, United States, kills 41 patients. * January 9 – The Israeli government recognizes the People's Republic of China. * January 12 – Submarine collides with Sweden, Swedish oil tanker ''Divina'' in the Thames Estuary and sinks; 64 die. * January 13 – Finland forms diplomatic relations with the People's Republic of Chin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1883 Births
Events January * January 4 – ''Life (magazine), Life'' magazine is founded in Los Angeles, California, United States. * January 10 – A Newhall House Hotel Fire, fire at the Newhall Hotel in Milwaukee, Wisconsin, United States, kills 73 people. * January 16 – The Pendleton Civil Service Reform Act, establishing the United States civil service, is passed. * January 19 – The first electric lighting system employing overhead wires begins service in Roselle, New Jersey, United States, installed by Thomas Edison. February * February 15 – Tokyo Electrical Lightning Grid, predecessor of Tokyo Electrical Power (TEPCO), one of the largest electrical grids in Asia and the world, is founded in Japan. * February 16 – The ''Ladies' Home Journal'' is published for the first time, in the United States. * February 23 – Alabama becomes the first U.S. state to enact an Competition law, antitrust law. * February 28 – The first vaudeville th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Reading
The University of Reading is a public research university in Reading, Berkshire, England. It was founded in 1892 as the University Extension College, Reading, an extension college of Christchurch College, Oxford, and became University College, Reading in 1902. The institution became a university with the power to grant its own degrees in 1926 by royal charter from King George V, and was the only university to receive such a charter between the two world wars. The university is usually categorised as a red brick university, reflecting its original foundation in the 19th century. Reading has four major campuses. In the United Kingdom, the campuses on London Road Campus, London Road and Whiteknights Park, Whiteknights are based in the town of Reading itself, and Greenlands, Buckinghamshire, Greenlands is based on the banks of the River Thames in Buckinghamshire. It also has a campus in Iskandar Puteri, Malaysia. The university has been arranged into 16 academic schools since 2016. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radiology
Radiology ( ) is the medical specialty that uses medical imaging to diagnose diseases and guide treatment within the bodies of humans and other animals. It began with radiography (which is why its name has a root referring to radiation), but today it includes all imaging modalities. This includes technologies that use no ionizing electromagnetic radiation, such as medical ultrasound, ultrasonography and magnetic resonance imaging (MRI), as well as others that do use radiation, such as x-ray computed tomography, computed tomography (CT), fluoroscopy, and nuclear medicine including positron emission tomography (PET). Interventional radiology is the performance of usually invasiveness of surgical procedures, minimally invasive medical procedures with the guidance of imaging technologies such as those mentioned above. The modern practice of radiology involves a team of several different healthcare professionals. A radiologist, who is a medical doctor with specialized post-graduate tr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Addenbrooke's Hospital
Addenbrooke's Hospital is a large teaching hospital and research centre in Cambridge Cambridge ( ) is a List of cities in the United Kingdom, city and non-metropolitan district in the county of Cambridgeshire, England. It is the county town of Cambridgeshire and is located on the River Cam, north of London. As of the 2021 Unit ..., England, with strong affiliations to the University of Cambridge. Addenbrooke's Hospital is located on the Cambridge Biomedical Campus. It is run by Cambridge University Hospitals NHS Foundation Trust and is a designated academic health science centre. It is also the East of England's major trauma centre and was the first such centre to be operational in the United Kingdom. History The hospital was founded in 1766 on Trumpington Street with £4,500 from the will of Dr John Addenbrooke (philanthropist), John Addenbrooke, a fellow of St Catharine's College, Cambridge, St Catharine's College. In 1962 the first building was opened on its present ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alfred Robb
Alfred Arthur Robb FRS (18 January 1873 in Belfast – 14 December 1936 in Castlereagh) was an Irish physicist. Biography Robb studied at Queen's College, Belfast (BA 1894) and at St John's College, Cambridge (Tripos 1897, MA 1901). He then proceeded to University of Göttingen, where, guided by Woldemar Voigt, he wrote his dissertation on the Zeeman effect. He also worked under J. J. Thomson at the Cavendish Laboratory. The Croix de Guerre was awarded to him for WWI service in the Red Cross, and in 1921 he became a fellow of the Royal Society. He is known for his four books on special relativity (1911, 1914, 1921, 1936) where he gave a spacetime derivation of the theory in an axiomatic-geometric way. Robb therefore was sometimes called the "Euclid of relativity". In the first of these works he used a hyperbolic angle ω to introduce the concept of rapidityRobb (1911) ''Optical Geometry of Motion'' and showed that the kinematic space of velocities is hyperbolic, so that "in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ernest Marsden
Sir Ernest Marsden (19 February 1889 – 15 December 1970) was an English-New Zealand physicist. He is recognised internationally for his contributions to science while working under Ernest Rutherford, which led to the discovery of new theories on the structure of the atom. In Marsden's later work in New Zealand, he became a significant member of the scientific community, while maintaining close links to the United Kingdom. Education Born in Manchester, the son of Thomas Marsden and Phoebe Holden, Marsden lived in Rishton and attended Queen Elizabeth's Grammar School, Blackburn, where an inter-house trophy rewarding academic excellence ('The Marsden Merit Trophy') bears his name. In 1909, as a 20-year-old student at the University of Manchester, he met and began work under Ernest Rutherford.Rebecca Priestley, 'Ernest Marsden, 1889-1970', in Veronika Meduna and Rebecca Priestley (eds.), Atoms, Dinosaurs and DNA:68 Great New Zealand Scientists (Random House New Zealand: Auckla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
JJ Thomson
Sir Joseph John Thomson (18 December 1856 – 30 August 1940) was an English physicist who received the Nobel Prize in Physics in 1906 "in recognition of the great merits of his theoretical and experimental investigations on the conduction of electricity by gases." In 1897, Thomson showed that cathode rays were composed of previously unknown negatively charged particles (now called electrons), which he calculated must have bodies much smaller than atoms and a very large charge-to-mass ratio. Thomson is also credited with finding the first evidence for isotopes of a stable (non-radioactive) element in 1913, as part of his exploration into the composition of canal rays (positive ions). His experiments to determine the nature of positively charged particles, with Francis William Aston, were the first use of mass spectrometry and led to the development of the mass spectrograph. Thomson was awarded the 1906 Nobel Prize in Physics for his work on the conduction of electricity in g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
